Charles M. Baker was appointed to fill Doolittle's unexpired term.

The evidence

• “Judge Doolittle resigned, and Charles M. Baker was appointed, March 7, 1856, to fill the unexpired term. At the next election, held April 7, 1856, John M. Keep was chosen, by the overwhelming majority of 6,483 votes.”

  1879-history-of-rock-county/11-rock-county-ch05-press-institutions-tragedy.md, PDF p. 419 / book p. 423

  Butterfield, C. W., et al. The History of Rock County, Wisconsin: its early settlement, growth, development, resources, etc. Chicago: Western Historical Company, 1879. Cornell University Library via the Internet Archive, archive.org/details/cu31924028871585.

  Grade A: Found on a page of one of our sources